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XXVII. 



THE ELEOTEICAL RESISTANCE OF PORCELAIN AT 

 DIFFERENT TEMPERATURES. 



By R. G. ALLEN, B.Sc., Lond. ; A.R.C.So.1. ; 



Assistant to the Professor of Applied Physics, Royal College of Science 



for Ireland, Dublin. 



(COMMUNICATED BY PEOFESSOE WILLIAM BBOWN.) 



[Read March 26 ; published June 14, 1918.] 



The electrical resistance of porcelain, in common with other insulating 

 materials, diminishes enormously with increase of temperature. This change 

 has been quantitatively investigated by a number of workers. 



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AUG! 



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Fig. 1 . — Arrangement for a simple test to show change of resistance of porcelain with temperature. 



A simple experiment was made to show this change, by using the 

 arrangement of fig. 1. P was a porcelain tube of inner diameter 08 cm. 



SCIENT. PEOC. K.D.S., VOL. XV., NO. XXVII. 



3b 



